Fixes#68
Rather than relying on the default serialization logic (which attempts
to parse a log as JSON and then load it into a wrapper class), we
now simply return the raw log data as expected. The previous behavior
worked in many cases because the log was serialized into a JSON string,
but in the case of #68 the log was loaded as a JSON float, which
made the error handling fail to fallback to returning the raw
data.
